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hw/i386/vmport: Add support for CMD_GETHZ 

This command returns to guest information on LAPIC bus frequency and TSC
frequency.

One can see how this interface is used by Linux vmware_platform_setup()
introduced in Linux commit 88b094fb8d4f ("x86: Hypervisor detection and
get tsc_freq from hypervisor").

Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-16-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Liran Alon 2020-03-12 18:54:30 +02:00 committed by Paolo Bonzini
parent 73b994f6d7
commit d6048bfd12
2 changed files with 20 additions and 0 deletions
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19
hw/i386/vmport.c
View File

@ -174,6 +174,24 @@ static uint32_t vmport_cmd_ram_size(void *opaque, uint32_t addr)
return ram_size;
}
static uint32_t vmport_cmd_get_hz(void *opaque, uint32_t addr)
{
X86CPU *cpu = X86_CPU(current_cpu);
if (cpu->env.tsc_khz && cpu->env.apic_bus_freq) {
uint64_t tsc_freq = (uint64_t)cpu->env.tsc_khz * 1000;
cpu->env.regs[R_ECX] = cpu->env.apic_bus_freq;
cpu->env.regs[R_EBX] = (uint32_t)(tsc_freq >> 32);
cpu->env.regs[R_EAX] = (uint32_t)tsc_freq;
} else {
/* Signal cmd as not supported */
cpu->env.regs[R_EBX] = UINT32_MAX;
}
return cpu->env.regs[R_EAX];
}
static uint32_t vmport_cmd_get_vcpu_info(void *opaque, uint32_t addr)
{
X86CPU *cpu = X86_CPU(current_cpu);
@ -211,6 +229,7 @@ static void vmport_realizefn(DeviceState *dev, Error **errp)
vmport_register(VMPORT_CMD_GETRAMSIZE, vmport_cmd_ram_size, NULL);
if (s->compat_flags & VMPORT_COMPAT_CMDS_V2) {
vmport_register(VMPORT_CMD_GETBIOSUUID, vmport_cmd_get_bios_uuid, NULL);
vmport_register(VMPORT_CMD_GETHZ, vmport_cmd_get_hz, NULL);
vmport_register(VMPORT_CMD_GET_VCPU_INFO, vmport_cmd_get_vcpu_info,
NULL);
}

1
include/hw/i386/vmport.h
View File

@ -13,6 +13,7 @@ typedef enum {
VMPORT_CMD_VMMOUSE_DATA = 39,
VMPORT_CMD_VMMOUSE_STATUS = 40,
VMPORT_CMD_VMMOUSE_COMMAND = 41,
VMPORT_CMD_GETHZ = 45,
VMPORT_CMD_GET_VCPU_INFO = 68,
VMPORT_ENTRIES
} VMPortCommand;